Clarence Edward Mulford (3 February 1883 - 10 May 1956) was the creator of the character Hopalong Cassidy and who wrote many works of fiction and nonfiction.
Born in Streator, Illinois, he created Hopalong Cassidy in 1904 while living in Fryeburg, Maine. The many short stories and 28 novels were adapted to radio, feature film, television, and comic books, often deviating significantly from the original stories, especially in the character's traits. While many of his stories depicted Cassidy and other men of the Bar-20 ranch, he also wrote novels (and short stories) of other Westerners, starting with Johnny Nelson in 1920. He also wrote nonfiction, mostly about the American West, the outdoors, and motoring.
Mulford died of complications from surgery in Portland, Maine, in 1956, aged 73. He set aside much of his money from his books for local charities.